Metadata: Identification_Information: Citation: Citation_Information: Originator: United States Geological Survey (USGS) Publication_Date: 2012 Title: Acoustic Backscatter - Outer Mainland Shelf, Eastern Santa Barbara Channel, California Geospatial_Data_Presentation_Form: Raster Online_Linkage: http://pubs.usgs.gov/ds/702/data.html Larger_Work_Citation: Citation_Information: Originator: Peter Dartnell Originator: Andy Ritchie Originator: David Finlayson Originator: Guy Cochrane Originator: Mercedes Erdey Publication_Date: 2012 Title: Bathymetry and Acoustic Backscatter - Outer Mainland Shelf, Eastern Santa Barbara Channel, California Edition: 1.0 Series_Information: Series_Name: Data Series Issue_Identification: 702 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/ds/702/ Description: Abstract: The U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center in cooperation with the Bureau of Ocean Energy Management (BOEM) collected high-resolution bathymetry and acoustic backscatter data along the outer mainland shelf in the eastern Santa Barbara Channel, southern California. These data were collected in July 2010 and July 2011 using a bathymetric sidescan system. This report provides the bathymetry and backscatter data along with a summary of the mapping efforts and Federal Geographic Data Committee (FGDC) metadata. This metadata file describes the acoustic backscatter data. Purpose: These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) or other software to display the acoustic backscatter data. These data are not intended for navigational purposes. Supplemental_Information: Information for the related USGS Pacific Coastal and Marine Science Center data collection field activities, S-14-10-SC and S-08-11-SC, online at and . Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20100628 Ending_Date: 20110726 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -119.7500000 East_Bounding_Coordinate: -119.2500000 North_Bounding_Coordinate: 34.37000000 South_Bounding_Coordinate: 34.10000000 Keywords: Theme: Theme_Keyword_Thesaurus: General Theme_Keyword: Marine Geology Theme_Keyword: Multibeam Theme_Keyword: Geology Theme_Keyword: Bathymetry Theme_Keyword: Backscatter Theme_Keyword: Intensity Theme_Keyword: Ocean Floor Topography Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Pacific Coastal and Marine Science Center Theme_Keyword: CMGP Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificinformation Theme_Keyword: imageryBaseMapsEarthCover Theme_Keyword: oceans Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Santa Barbara Channel Place_Keyword: Ventura Place_Keyword: Carpinteria Place_Keyword: Santa Barbara Place_Keyword: State of California Place: Place_Keyword_Thesaurus: General Place_Keyword: California Place_Keyword: CA Place_Keyword: USA Access_Constraints: None Use_Constraints: Please recognize the U.S. Geological Survey (USGS) and the Bureau of Ocean Energy Management (BOEM). USGS-authored or produced data and information are in the public domain. This information is not intended for navigational purposes. Read and fully comprehend the metadata prior to data use. Uses of these data should not violate the spatial resolution of the data. Where these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution of all the data. Acknowledge the U.S. Geological Survey in products derived from these data. Share data products developed using these data with the U.S. Geological Survey. This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Peter Dartnell Contact_Organization: U.S. Geological Survey, Pacifc Coastal and Marine Science Center Contact_Position: Physical Scientist Contact_Address: Address_Type: mailing and physical address Address: 400 Natural Bridge Dr. City: Santa Cruz State_or_Province: CA Postal_Code: 95060-5792 Country: USA Contact_Voice_Telephone: (831) 460-7415 Contact_Facsimile_Telephone: (831) 427-4709 Contact_Electronic_Mail_Address: pdartnell@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: Browse_Graphic_File_Description: Acoustic backscatter imagery of the eastern Santa Barbara Channel region Browse_Graphic_File_Type: GIF Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Not applicable for raster data. Logical_Consistency_Report: Unspecified Completeness_Report: Complete Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: 0.5 meters Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Not applicable Lineage: Process_Step: Process_Description: The bathymetry and backscatter data were collected using 234.5 kHz SEA (AP) Ltd. SWATHplus-M phase-differencing sidescan sonar aboard the USGS R/V Parke Snavely. The survey vessel was equipped with a CodaOctopus F190 attitude and position system. This system combines Real Time Kinematic (RTK) Global Positioning System (GPS) data (2 centimeter error ellipse) with inertial motion measurements so that high-precision position and attitude corrections are fed in real-time to the sonar acquisition equipment. Up to 10 pings per second are transmitted with each ping consisting of 2048 samples per side (port and starboard). The returned samples are projected to the seafloor using a ray-tracing algorithm working with the previously measured sound velocity profiles. A series of statistical filters are applied to the raw samples that discriminate the seafloor returns from other unintended targets in the water column. The raw 16-bit backscatter data recorded simultaneously with bathymetry by the SWATHplus was georeferenced and gain-normalized by the program SXPEGN, software written by the USGS to enhance the backscatter of the SWATHplus system. The program normalizes for time-varying signal loss and beam directivity differences. The resulting normalized amplitude values are re-scaled to 16-bit, and gridded into GeoJPEGS using GRID Processor Software supplied by SEA. The images were converted to geoTIFF images using ESRI GIS software. Process_Date: 2012 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Pete Dartnell Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Position: Physical Scientist Contact_Address: Address_Type: mailing and physical address Address: 400 Natural Bridges Dr. City: Santa Cruz State_or_Province: CA Postal_Code: 95060-5792 Country: USA Contact_Voice_Telephone: (831) 460-7415 Contact_Electronic_Mail_Address: pdartnell@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 11 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -117.00000 Latitude_of_Projection_Origin: 0.00000 False_Easting: 500000.0 False_Northing: 0.00 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 2.0 Ordinate_Resolution: 2.0 Planar_Distance_Units: Meters Geodetic_Model: Horizontal_Datum_Name: NAD83 Ellipsoid_Name: NAVD88 Semi-major_Axis: 6378137.00 meters Denominator_of_Flattening_Ratio: 0.003352811 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: The complete 2010 - 2011 acoustic backscatter data was originally archived as an ESRI grid with the following attributes: >Cell size = 2.0 >Number of rows = 14,271 >Number of columns = 21,553 > >Data type = floating point > >Boundary >Xmin = 247426.13 >Xmax = 290542.13 >Ymin = 3777642.27 >Ymax = 3806184.27 > >Statistics >Minimum value = 0 >Maximum value = 65535 >Mean = 2712641 >Standard deviation = 11370.68 > >Coordinate system description >Projection UTM >Zone 11 >Datum NAD83 >Units meter Entity_and_Attribute_Detail_Citation: none Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical address Address: 345 Middlefield Rd City: Menlo Park State_or_Province: CA Postal_Code: 94025-3561 Country: USA Contact_Voice_Telephone: (650) 329-4309 Distribution_Liability: This information is not intended for navigational purposes. This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ASCIIRASTER and geoTIFF Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/ds/702/ Fees: None Metadata_Reference_Information: Metadata_Date: 20120325 Metadata_Review_Date: 20120403 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Peter Dartnell Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Position: Physical Scientist Contact_Address: Address_Type: mailing and physical address Address: 400 Natural Bridges Dr. City: Santa Cruz State_or_Province: CA Postal_Code: 95060-5792 Country: USA Contact_Voice_Telephone: (831) 460-7415 Contact_Facsimile_Telephone: (831) 427-4709 Contact_Electronic_Mail_Address: pdartnell@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata ("CSDGM version 2") Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: universal time